Definition:
Glaciers are masses of land ice, formed by the further recrystallization offirn, flowing continuously from higher to lower elevations. Ice sheets are acontinuous sheet of land ice that covers a very large area and moves outward inmany directions. This type of ice mass is so thick as to mask the land surfacecontours, in contrast to the smaller and thinner highland ice. The continentalglacier of Greenland is sometimes called the Inland Ice. This term is oftenused to describe the great ice masses that characterized the ice ages.